doppler effects

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Definitions from WordNet

Noun doppler effect has 1 sense

Doppler effect, Doppler shift - change in the apparent frequency of a wave as observer and source move toward or away from each other
--₁ is a kind of propagation
--₁ has particulars: red shift

Definitions from the Web

Doppler Effects

Definition: The Doppler effect refers to the change in frequency or wavelength of a wave as observed by an observer moving relative to the source of the wave.

Examples:

Noun (Physics): The Doppler effects can be observed when the pitch of a siren changes as an ambulance approaches or moves away from the listener.

Sample Sentence: The Doppler effects are responsible for the shift in pitch of a passing train's horn.

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